JP2018188014A - Vehicle front body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight vehicle front body structure, capable of restraining a stress from being concentrated on a portion on which an outer frame corner part 7e is mounted, of a connection part of a front frame 7 with a dash panel 3 of the front frame, when an oblique impact load is input into the front frame 7 coupled to the dash panel 3 as a result of the front frame inclining more inward as it goes more backward, thereby smoothly transmitting a load toward backward of the vehicle body.SOLUTION: The vehicle front body structure includes a floor reinforcing member 9 extending backward of a vehicle from the lower part of a dash panel 3. The floor reinforcing member 9 includes an outer reinforcing member corner part 9e between a reinforcing member upper face part 9a and a reinforcing member outer face part 9c. The front frame 7 includes an outer frame corner part 7e between a top face part 71a and an outer face part 72a. The outer reinforcing member corner part 9e and the outer frame corner part 7e are formed so that they incline more inward in the vehicle width direction to be continuous as they go more backward in a vehicle plane view.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a front vehicle body structure of a vehicle, and more particularly to a floor panel behind a dash panel connected to a front frame inclined inward in the vehicle width direction toward the rear, and attached to an upper surface of the floor panel. The present invention relates to a vehicle front body structure that includes a floor reinforcing member that extends rearward from a lower portion.

  Conventionally, from the viewpoint of protecting passengers in the passenger compartment against a frontal collision such as a collision from the front of the vehicle, the dash panel and the floor panel are prevented from being deformed or intruded into the passenger compartment by a collision load applied from the front of the vehicle. There is a need to.

  For this reason, a technique is known in which the front frame is bent and deformed to absorb collision energy, thereby reducing the load transmitted rearward and suppressing the deformation of the dash panel and floor panel into the vehicle interior.

  For example, in the invention described in Patent Document 1, a front frame (front side frame) extending in the vehicle front-rear direction is inclined inward as it goes rearward of the vehicle, and is coupled to a dash panel that partitions the engine room and the cabin at the rear end. From there, it extends as a floor frame (rear frame) to the rear of the vehicle so as to sink into the lower part of the dash panel. In addition, a part of the front frame is configured to bend and deform outward in the vehicle width direction due to the load at the time of the front collision, and the sub-frame disposed below the vehicle body is coupled to the front frame via a reinforcement And a configuration in which the front portion of the reinforcement is set at a position corresponding to a planned bending portion of the front frame that is bent outwardly in the vehicle width direction at the time of a front collision. Has been.

In this way, since the difference in rigidity between the portion to be bent and the front frame portion reinforced by the reinforcement can be set large, when the collision load acts on the front frame, it is described above. Due to the difference in rigidity, it is possible to more reliably cause the mountain deformation at the planned bending portion.
In other words, the front part of the reinforcement can be used as the starting point of the above-mentioned mountain fold deformation, thereby making it possible to further promote the bending at the planned bending portion of the front frame and the collision load on the occupant Can be more reliably reduced.

JP 2011-088597 A

On the other hand, when a frontal collision (hereinafter referred to as oblique collision) occurs in a frontal collision that strikes the front of the vehicle obliquely from the front of the vehicle, the front end of the vehicle collides earlier in the vehicle width direction than in the vehicle width direction. Since the load is input, the collision load is transmitted through the corner of the front frame in the vehicle width direction (outer frame corner).
The front frame is inclined inward in the vehicle width direction as it goes rearward and coupled to the dash panel, so that when the front frame undergoes bending deformation that folds outward in the vehicle width direction, the front frame Of the connecting portions with the dash panel, the outer connecting portion in the vehicle width direction is displaced rearward relative to the inner connecting portion in the vehicle width direction. In other words, the stress concentrates on the outer coupling portion in the vehicle width direction rather than the inner coupling portion in the vehicle width direction, and deformation occurs such that the outer coupling portion in the vehicle width direction enters the vehicle interior side.
In order to suppress this deformation, measures such as increasing the thickness of the dash panel or toeboard panel, making the material stronger, or attaching a reinforcing member can be considered. There is a possibility that a new problem of increase will occur.

  Accordingly, the present invention provides a front frame that is inclined inward in the vehicle width direction and is coupled to the dash panel as it goes rearward at a portion where an outer frame corner is attached when an oblique impact load is input from the front of the vehicle. It is an object of the present invention to provide a vehicle front body structure that can suppress stress concentration and can smoothly transmit a load to the rear of the vehicle body with a lightweight structure.

Techniques for solving problems

In order to achieve the above object, in the present invention,
A front frame extending in the longitudinal direction of the vehicle;
A dash panel to which the rear portion of the front frame is attached and extends in the vehicle width direction;
A toeboard panel extending rearward from the bottom of the dash panel;
A floor panel extending rearward from the rear of the toeboard panel;
A floor frame that extends to the rear of the vehicle continuously to the front frame and is attached to the toe board panel and the lower surface of the floor panel;
A front body structure of a vehicle comprising:
A floor reinforcing member attached to the upper surface of the toe board panel and the floor panel, and extending from the lower part of the dash panel to the rear of the vehicle;
The floor reinforcing member includes a reinforcing member upper surface portion facing the toe board panel and the floor panel, a reinforcing member inner surface portion extending downward from an inner end portion in the vehicle width direction of the reinforcing member upper surface portion, and the reinforcing member upper surface portion. A reinforcing member outer surface portion extending downward from the vehicle width direction outer end portion, and an outer reinforcing member corner portion between the reinforcing member upper surface portion and the reinforcing member outer surface portion,
The front frame includes an upper surface portion, a lower surface portion facing below the upper surface portion, an inner surface portion connecting the upper surface portion and the lower surface portion on the inner side in the vehicle width direction, and the upper surface portion and the lower surface portion. An outer surface portion connected on the outer side in the vehicle width direction, and an outer frame corner portion between the upper surface portion and the outer surface portion,
The outer reinforcing member corner portion and the outer frame corner portion are provided so as to continue to incline inward in the vehicle width direction toward the rear in a plan view of the vehicle.

  With the above configuration, when an oblique collision load is transmitted through the outer frame corner portion, the outer reinforcing member corner portion is provided so as to incline and continue inward in the vehicle width direction as it goes rearward in a vehicle plan view. Therefore, the outer reinforcing member corner acts to stretch through the dash panel with respect to the direction in which the dash panel to which the outer frame corner is attached enters the vehicle interior side, and the load is smoothly transmitted to the rear of the vehicle. be able to. This prevents stress from concentrating on the parts where the outer frame corners are attached, and allows the load to be transmitted smoothly to the rear of the vehicle, so that the dash panel to which the outer frame corners are attached enters the interior of the vehicle. Can be suppressed.

In the front body structure of the vehicle,
A first bent portion between the lower portion of the dash panel and the toeboard panel;
The toe board panel is provided to be inclined and extend rearward as it goes downward,
A second bent portion between the rear portion of the toe board panel and the floor panel;
The upper surface portion has an upper surface bonding portion attached in the vicinity of the first bent portion,
The reinforcing member upper surface portion has a reinforcing member upper surface joint portion attached in the vicinity of the first bent portion,
It is preferable that the upper surface joint portion and the reinforcing member upper surface joint portion are provided so as to overlap in a vehicle front view.

  As a result, the front frame upper surface joining portion is attached in the vicinity of the first bent portion, so that the front frame upper surface joining portion is attached to the upper portion of the front frame upper surface with respect to the second bent portion. The amount of offset in the height direction of the part is reduced, the bending moment generated in the front frame is suppressed, and the deformation of the dash panel rotating toward the vehicle interior side around the second bent part can be suppressed smoothly. The load can be transmitted to the rear of the vehicle.

  On the other hand, when the front frame upper surface joint portion is attached to the first bent portion as described above, a load that pushes the first bent portion into the vehicle interior side increases. Therefore, by providing the reinforcing member upper surface joint portion and the front frame upper surface joint portion so as to overlap with each other when viewed from the front of the vehicle, the load that the front frame upper surface portion tries to push the first bent portion is applied to the floor reinforcing member upper surface joint portion. The load can be transmitted to the rear of the vehicle more smoothly.

In the front body structure of the vehicle,
The upper surface joint portion is an upper flange portion that extends upward from the upper surface portion and joins the dash panel,
It is preferable that the reinforcing member upper surface joining portion is a reinforcing member upper flange portion that extends upward from the reinforcing member upper surface portion and is joined to the dash panel.

  Accordingly, the upper flange portion and the reinforcing member upper flange portion are provided so as to overlap with each other when viewed from the front of the vehicle, so that the impact load can be smoothly transmitted from the upper flange portion to the reinforcing member upper flange portion. .

In the front body structure of the vehicle,
The front frame has an outer flange portion that extends outward in the vehicle width direction from the outer surface portion and is joined to the dash panel.
The floor reinforcing member has a reinforcing member outer flange portion that extends in the vehicle width direction outer direction from the reinforcing member outer surface portion and is joined to the dash panel.
It is preferable that the outer flange portion and the reinforcing member outer flange portion are provided so as to overlap in a vehicle front view.

  Thereby, since the outer flange portion and the reinforcing member outer flange portion are provided so as to overlap with each other when viewed from the front of the vehicle, the impact load can be smoothly transmitted from the outer flange portion to the reinforcing member outer flange portion.

  As described above, according to the present invention, the outer reinforcing member corner portion and the outer frame corner portion are provided so as to incline and continue inward in the vehicle width direction toward the rear in the vehicle plan view. Suppresses the concentration of stress on the part where the corner of the outer frame is attached to the front frame that is tilted inward in the vehicle width direction and is connected to the dash panel when the oblique impact load is input from the front of the vehicle. In addition, the front body structure of the vehicle that can smoothly transmit the load to the rear of the vehicle body can be provided with a lightweight structure.

The side view which shows the front part vehicle body structure of the vehicle of this invention The perspective view shown in the state seen from diagonally upward of the compartment side of FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 1 is a plan view showing a state viewed from above with the dash panel of FIG. 1 removed. The figure seen from the passenger compartment side of FIG. BB cross-sectional view of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, terms indicating directions such as “front”, “rear”, “front / rear”, “left”, “right”, “left / right”, etc. It shall indicate the direction when the traveling direction is “front”.

  An embodiment of the present invention will be described in detail with reference to the drawings. The drawing shows the front body structure of the vehicle, and FIG. 1 shows the front body structure as viewed from the inside in the vehicle width direction with the section between the tunnel portion 6 and the floor reinforcing member 9 in the vehicle width direction. FIG. 2 is a side view, and FIG. 2 is a perspective view showing the structure of FIG. 1 as viewed obliquely from the vehicle compartment side.

1 and 2, a dash panel 3 that partitions the front portion of the vehicle compartment 1 and the engine room 2 in the front-rear direction is provided. The above-described dash panel 3 extends in the up-down direction and the vehicle width direction, and is formed so as to be inclined downward toward the front of the vehicle.
In addition, the wheel houses 3a and 3a are integrally or integrally formed on the left and right vehicle width direction outer sides of the dash panel 3 described above.

As shown in FIGS. 1 and 2, the dash lower panel 3 includes a toeboard panel 4 extending in the front-rear direction of the vehicle so as to incline downward toward the vehicle rear side continuously via the first bent portion 30, The toe board panel 4 is formed of a high-tensile steel plate (so-called high-tensile steel).
The toe board panel 4 has a steering opening 4a for inserting a steering shaft (not shown) for connecting the steering gear and the steering wheel.

  A floor panel 5 is provided at the rear of the toeboard panel 4 through the second bent portion 40 and extends substantially horizontally behind the vehicle. The floor panel 5 forms the bottom surface of the vehicle compartment 1. ing.

As shown in FIG. 2, a tunnel portion 6 that protrudes toward the passenger compartment 1 is formed in the vehicle width direction center portion of the toe board panel 4 and the floor panel 5 described above.
The above-described tunnel portion 6 has tunnel portions 6a and 6b on the toe board panel 4 side and a tunnel portion 6c on the floor panel 5 side, and is formed so as to be continuous in the longitudinal direction of the vehicle.

On the other hand, as shown in FIG. 1, a pair of left and right front frames 7, 7 extending from the dash panel 3 to the front side of the vehicle on both the left and right sides of the engine room 2 (however, only one front frame 7 is shown in the drawing). Have.
The front frame 7 is a vehicle body member having a closed cross section that is joined and fixed to the front frame inner 71 and the front frame outer 72 and extends in the front-rear direction of the vehicle.

The above-described front frame inner 71 includes a horizontally extending upper surface portion 71a, an inner surface portion 71b extending downward from an inner end portion in the vehicle width direction of the upper surface portion 71a, and a lower surface of the inner surface portion 71b facing the upper surface portion 71a in the vehicle width direction. It has a lower surface portion 71c extending outward, and is formed in a substantially U shape in a vehicle front sectional view that opens outward in the vehicle width direction.
An upper flange portion 71d extending upward at the vehicle width direction outer end portion of the upper surface portion 71a and a lower flange portion 71e extending downward at the outer end portion in the vehicle width direction of the lower surface portion 71c are provided.

The front frame outer 72 has an outer surface portion 72a that has a substantially planar shape and extends in the front-rear direction of the vehicle. The front frame outer 72 includes an upper flange portion 72d that extends upward from the upper end portion of the outer surface portion 72a, and a lower end portion of the outer surface portion 72a. And a lower flange portion 72e extending downward.
The front frame 7 is joined and fixed between the upper flange portions 71d and 72d and the lower flange portions 71e and 72e, and forms a substantially rectangular closed cross section when viewed from the front of the vehicle.

  Further, as shown in FIG. 3, the front frame 7 includes an upper flange portion 71f extending upward from an upper surface portion 71a provided at the rear, an outer flange portion 72f extending outward from the outer surface portion 72a in the vehicle width direction, and an inner surface portion 71b. An inner flange portion 71g extending inward in the vehicle width direction, the upper flange portion 71f and the outer flange portion 72f are joined and fixed to the dash panel 3, and the inner flange portion 71g is joined and fixed to the toe board panel 4. ing.

  As shown in FIG. 4, the outer frame corner portion 7e between the upper surface portion 71a and the outer surface portion 72a of the front frame 7 and the corner portion between the upper surface portion 71a and the inner surface portion 71b in the vehicle plan view are directed toward the rear. Inclined inward in the vehicle width direction. Further, the inner surface portion 71b has a bead portion 71h that protrudes outward in the vehicle width direction and extends vertically on the dash panel 3 side in the vehicle front-rear direction.

As shown in FIG. 1, a floor frame 8 extending from the rear end portion of the front frame 7 to the rear side of the vehicle along the toe board panel 4 and the floor panel 5 is provided.
The vehicle front sectional view of the floor frame 8 is formed in an inverted hat shape, and includes a bottom wall 8a, left and right side walls 8b, 8b, and left and right joint flange portions extending in the vehicle width direction from the upper ends of the left and right side walls 8b, 8b. 8c, 8c, and the left and right joint flanges 8c, 8c are spot welded to the lower surface of the toe board panel 4 and the lower surface of the floor panel 5, so that the floor frame 8 is connected to the toe board from the rear end of the front side frame 7. It is configured to extend along the panel 4 and the floor panel 5 to the rear side of the vehicle.

  A floor frame closed section that is continuous in the front-rear direction of the vehicle is formed between the floor frame 8 and the toe board panel 4 and between the floor frame 8 and the floor panel 5 to improve the rigidity of the lower part of the vehicle body. It is comprised so that it may aim.

  As shown in FIGS. 1 and 2, the toe board panel 4 and the floor panel 5 have an extending direction of the floor frame 8 on both the passenger seat side (left side in FIG. 2) and the driver seat side (right side in FIG. 2) ( A floor reinforcing member 9 extending in the vehicle front-rear direction along the vehicle front-rear direction is provided.

The floor reinforcing member 9 is opposed to the floor panel 5 and extends along the floor panel 5, a reinforcing member inner surface portion 9b extending downward from an inner end in the vehicle width direction of the reinforcing member upper surface portion 9a, and reinforcing Reinforcing member outer surface portion 9c extending downward from the vehicle width direction outer side end portion of member upper surface portion 9a, and joining flange portion 9d integrally formed extending from the lower end of reinforcing member inner surface portion 9b and reinforcing member outer surface portion 9c in the vehicle width direction. , 9d, and the vehicle front sectional view is a hat shape. The joint flange portions 9d, 9d are provided with a plurality of paired left and right beads protruding upward in the front-rear direction.
The left and right joining flange portions 9d and 9d are joined and fixed to the toe board panel 4 and the floor panel 5 by spot welding.

  As shown in FIG. 2, at the front end position of the floor reinforcing member 9, a reinforcing member upper flange portion 9f extending upward from the reinforcing member upper surface portion 9a and a reinforcing member outer flange portion extending outward in the vehicle width direction from the reinforcing member outer surface portion 9c. 9 g and a reinforcing member inner flange portion 9 h extending inward in the vehicle width direction from the lower end of the reinforcing member inner surface portion 9 b, and the reinforcing member upper flange portion 9 f and the reinforcing member outer flange portion 9 g are joined to the dash panel 3. The reinforcing member inner flange portion 9h is joined and fixed to the toe board panel 4.

FIG. 4 is a plan view of the state seen from above with the dash panel 3 removed from the configuration of FIG.
As shown in FIG. 4, the outer reinforcing member corner portion 9e between the reinforcing member upper surface portion 9a and the reinforcing member outer surface portion 9c in the vehicle plan view is provided to be inclined inward in the vehicle width direction toward the rear. The front frame 7 is provided continuously via the outer frame corner 7 e between the upper surface 71 a and the outer surface 72 a and the dash panel 3.

  FIG. 5 is a rear view of the configuration of FIG. 4 as viewed from the passenger compartment side. As shown in FIG. 5, the upper flange portion 71f (the overlapping portion with the floor reinforcing member 9 is indicated by a dotted line) and the reinforcing member upper flange portion 9f are provided so as to overlap with each other through the dash panel 3 when viewed from the front of the vehicle. Yes. Further, the reinforcing member upper flange portion 9 f is configured to extend over the front frame inner 71 and the front frame outer 72. Further, the floor reinforcing member 9 is configured such that the inner end position of the reinforcing member outer flange portion 9g is substantially the same in the vehicle width direction from the inner end position of the outer flange portion 72f in the vehicle width direction.

As shown in FIGS. 5 and 6, the outer flange portion 72 f and the reinforcing member outer flange portion 9 g are provided so as to overlap with each other when viewed from the front of the vehicle via the dash panel 3.
Collision load transmitted to the outer frame corner portion 7e between the upper surface portion 71a and the outer surface portion 72a of the front frame 7 by the overlap between the upper flange portions 71f and 9f and the outer flange portions 72f and 9g. However, it is comprised so that it may be efficiently transmitted to the reinforcement member corner | angular part 9e between the reinforcement member upper surface part 9a of the floor reinforcement member 9, and the reinforcement member outer surface part 9c.

Further, as shown in FIG. 3, the upper surface portion 71a of the front frame 7 and the reinforcing member upper surface portion 9a of the floor reinforcing member 9 are provided so as to be continuous in a vehicle side view. Further, the upper flange portion 71f and the reinforcing member upper flange portion 9f are provided so as to face each other with the dash panel 3 interposed therebetween, and are joined together by three pieces.
Thereby, the collision load transmitted to the upper surface portion 71a is configured to be smoothly transmitted to the reinforcing member upper surface portion 9a.

As shown in FIG. 6, the outer surface portion 72a of the front frame 7 and the reinforcing member outer surface portion 9c of the floor reinforcing member 9 are provided so as to be continuous in a vehicle plan view.
Thus, the collision load transmitted to the outer surface portion 72a is smoothly transmitted to the reinforcing member outer surface portion 9c.

As shown in FIG. 4, the rear portion of the floor reinforcing member 9 is joined and fixed so as to be orthogonal to the cross member 10 extending in the vehicle width direction.
The cross member 10 has a hat shape when viewed from the side of the vehicle, is joined to the floor panel 5, the inner end in the vehicle width direction is joined to the tunnel portion 6, and the outer end in the vehicle width direction is joined and fixed to a side sill (not shown). Has been.
The rear part of the floor reinforcing member 9 is joined and fixed by the cross member 10 and the floor panel 5.

The illustrated embodiment is configured as described above, and the operation will be described below.
If a load of a predetermined value or more is input to the bumper rain (not shown) at the time of an oblique collision of the vehicle, the front of the front frame 7 is compressed and deformed after the crash can (not shown) is crushed. At this time, since the collision load is input to the outer side in the vehicle width direction than the inner side in the vehicle width direction of the front frame 7, the collision load is transmitted to the rear of the front frame 7 through the outer frame corner portion 7e. At this time, stress concentrates on the bead portion 71h provided at the rear of the front frame 7, and the front frame 7 is inclined inward in the vehicle width direction and is coupled to the dash panel 3 as it goes rearward. Bending deformation occurs in such a way that the mountain folds outward. At that time, among the coupling portions of the front frame 7 to the dash panel 3, the vehicle width direction outer coupling portion (outer flange portion 72f) tends to be displaced rearward from the vehicle width direction inner coupling portion (inner flange portion 71g). Since the outer reinforcing member corner portion 9e and the outer frame corner portion 7e are provided so as to incline and continue inward in the vehicle width direction toward the rear of the vehicle in a plan view of the vehicle, the outer frame corner portion 7e is attached. The outer reinforcing member corner portion 9e acts so as to stretch through the dash panel 3 with respect to the direction in which the vicinity of the first bent portion 30 enters the vehicle interior side.

  Thus, the collision load is smoothly transmitted to the outer reinforcing member corner 9e, and further transmitted to the cross member 10 to which the rear end of the reinforcing member 9 is attached, and further to the vehicle body rigid member such as a side sill via the cross member 10. As a result, smooth load transmission to the rear of the vehicle is achieved. Accordingly, the front of the vehicle that suppresses deformation such that the dash panel 3 to which the outer frame corner portion 7e is attached enters the vehicle interior direction without concentrating stress in the vicinity of the first bent portion 30 to which the outer frame corner portion 7e is attached. The vehicle body structure can be provided with a lightweight structure.

  Further, the load input to the corner portion between the lower surface portion 71c and the outer surface portion 72a of the front frame 7 is input to the corner portion of the floor frame 8 connected to the rear, and the load is transmitted to the rear of the vehicle. The

Thus, the front vehicle body structure of the vehicle is
A front frame 7 extending in the longitudinal direction of the vehicle;
A dash panel 3 to which the rear portion of the front frame 7 is attached and extends in the vehicle width direction;
A toeboard panel 4 extending rearward from the lower portion of the dash panel 3;
A floor panel 5 extending rearward from the rear of the toeboard panel 4;
A floor frame 8 extending rearward of the vehicle continuously to the front frame 7 and attached to the toe board panel 4 and the lower surface of the floor panel 5;
A front body structure of a vehicle comprising:
A floor reinforcing member 9 attached to the upper surface of the toeboard panel 4 and the floor panel 5 and extending rearward from the lower portion of the dash panel 3;
The floor reinforcing member 9 includes a reinforcing member upper surface portion 9a that faces the toe board panel 4 and the floor panel 5, and a reinforcing member inner surface portion 9b that extends downward from an inner end in the vehicle width direction of the reinforcing member upper surface portion 9a. A reinforcing member outer surface portion 9c extending downward from the vehicle width direction outer side end portion of the reinforcing member upper surface portion 9a, an outer reinforcing member corner portion 9e between the reinforcing member upper surface portion 9a and the reinforcing member outer surface portion 9c, Have
The front frame 7 includes an upper surface portion 71a, a lower surface portion 71c facing below the upper surface portion 71a, an inner surface portion 71b connecting the upper surface portion 71a and the lower surface portion 71c on the inner side in the vehicle width direction, and the upper surface portion. An outer surface portion 72a that connects the lower surface portion 71c and the lower surface portion 71c on the outer side in the vehicle width direction, and an outer frame corner portion 7e between the upper surface portion 71a and the outer surface portion 72a,
The outer reinforcing member corner portion 9e and the outer frame corner portion 7e are provided so as to incline and continue inward in the vehicle width direction toward the rear in a vehicle plan view.

  According to this configuration, when the oblique collision load is transmitted through the outer frame corner portion 7e, the outer reinforcing member corner portion 9e continues to incline inward in the vehicle width direction toward the rear in the vehicle plan view. Since the dash panel 3 to which the outer frame corner portion 7e is attached enters the vehicle interior side, the outer reinforcing member corner portion 9e acts so as to stretch through the dash panel 3 to The load can be transmitted smoothly. Thereby, it can suppress that stress concentrates on the site | part to which the outer frame corner | angular part 7e is attached, and can suppress the deformation | transformation which the dash panel 3 to which the outer frame corner | angular part 7e is attached enters in a vehicle interior direction.

  A first bent portion 30 is provided between the lower portion of the dash panel 3 and the toe board panel 4, and the toe board panel 4 is provided so as to extend obliquely rearward as it goes downward. The second bent portion 40 is provided between the rear portion and the floor panel 5, and the upper surface portion 71a has an upper surface joint portion (upper flange portion 71f) attached in the vicinity of the first bent portion 30, The reinforcing member upper surface portion 9a has a reinforcing member upper surface joint portion (reinforcement member upper flange portion 9f) attached in the vicinity of the first bent portion 30, and the upper surface joint portion 71f and the reinforcing member upper surface joint portion 9f are vehicles. It is provided overlapping in front view.

According to this configuration, the front frame upper surface joining portion 71f is attached in the vicinity of the first bent portion 30, so that the second front frame upper surface joining portion 71f is attached to the upper side of the first bent portion 30. The amount of offset in the height direction of the position of the front frame upper surface portion 71a with respect to the bent portion 40 is reduced, the bending moment generated in the front frame 7 is suppressed, and the dash panel 3 rotates to the vehicle interior side around the second bent portion 40. Such deformation can be suppressed, and the load can be smoothly transmitted to the rear of the vehicle.
On the other hand, when the front frame upper surface joining portion 71f is attached to the first bent portion 30 as described above, a load that pushes the first bent portion 30 into the vehicle interior side increases. Therefore, the reinforcing member upper surface joint portion 9f and the front frame upper surface joint portion 71f are provided so as to overlap each other when viewed from the front of the vehicle, whereby the front frame upper surface portion 71a reinforces the load to push the first bent portion 30 into the floor. It can be effectively transmitted to the member upper surface joint portion 9f, and the load can be transmitted more smoothly to the rear of the vehicle.

  Further, the front frame 7 has an outer flange portion 72f extending outward in the vehicle width direction from the outer surface portion 72a and joined to the dash panel 3, and the floor reinforcing member 9 is connected to the reinforcing member outer surface portion 9c. A reinforcing member outer flange portion 9g extending outward in the width direction and joined to the dash panel 3 is provided, and the outer flange portion 72f and the reinforcing member outer flange portion 9g are provided to overlap in a front view of the vehicle. Yes.

  According to this configuration, since the outer flange portion 72f and the reinforcing member outer flange portion 9g are provided so as to overlap in a front view of the vehicle, the impact load is smoothly transferred from the outer flange portion 72f to the reinforcing member outer flange portion 9g. Can be communicated to.

  The above-described embodiments are merely examples, and the scope of the present invention should not be interpreted in a limited manner. The scope of the present invention is defined by the scope of the claims, and all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  For example, in the above-described embodiment, the front frame upper surface joint portion and the reinforcing member upper surface joint portion correspond to the upper flange portion 71f and the reinforcing member upper flange portion 9f, respectively, but the upper surface portion 71a and the reinforcing member upper surface portion 9a are connected to the dash panel. 3 may be joined by welding.

  In the above-described embodiment, the first bent portion 30 is formed on the toe board 4, but may be provided on the dash panel 3.

  As described above, the present invention is attached to the floor panel 5 behind the dash panel 3 connected to the front frame 7 inclined inward in the vehicle width direction toward the rear, and the upper surface of the floor panel 5. This is useful for a vehicle front body structure including a floor reinforcing member 9 extending from the lower part to the rear of the vehicle.

DESCRIPTION OF SYMBOLS 1 Car compartment 2 Engine room 3 Dash panel 4 Toe board panel 5 Floor panel 6 Tunnel part 7 Front frame 7e Outer frame corner part 8 Floor frame 9 Floor reinforcement member 30 1st bending part 40 2nd bending part 71 Front frame inner 71a Upper surface part 71f Upper flange (upper surface joint)
72 front frame outer 72a outer surface portion 72f outer flange portion 8 floor frame 9 floor reinforcing member 9a reinforcing member upper surface portion 9c reinforcing member outer surface portion 9e outer reinforcing member corner portion 9f reinforcing member upper flange portion (reinforcing member upper flange portion)
9g Reinforcement member outer flange

Claims (4)

A front frame extending in the longitudinal direction of the vehicle;
A dash panel to which the rear portion of the front frame is attached and extends in the vehicle width direction;
A toeboard panel extending rearward from the bottom of the dash panel;
A floor panel extending rearward from the rear of the toeboard panel;
A floor frame that extends to the rear of the vehicle continuously to the front frame and is attached to the toe board panel and the lower surface of the floor panel;
A front body structure of a vehicle comprising:
A floor reinforcing member attached to the upper surface of the toe board panel and the floor panel, and extending from the lower part of the dash panel to the rear of the vehicle;
The floor reinforcing member includes a reinforcing member upper surface portion facing the toe board panel and the floor panel, a reinforcing member inner surface portion extending downward from an inner end portion in the vehicle width direction of the reinforcing member upper surface portion, and the reinforcing member upper surface portion. A reinforcing member outer surface portion extending downward from the vehicle width direction outer end portion, and an outer reinforcing member corner portion between the reinforcing member upper surface portion and the reinforcing member outer surface portion,
The front frame includes an upper surface portion, a lower surface portion facing below the upper surface portion, an inner surface portion connecting the upper surface portion and the lower surface portion on the inner side in the vehicle width direction, and the upper surface portion and the lower surface portion. An outer surface portion connected on the outer side in the vehicle width direction, and an outer frame corner portion between the upper surface portion and the outer surface portion,
A vehicle body structure for a front part of a vehicle, wherein the outer reinforcing member corner portion and the outer frame corner portion are provided so as to incline and continue inward in the vehicle width direction toward the rear in a plan view of the vehicle. . A first bent portion between the lower portion of the dash panel and the toeboard panel;
The toe board panel is provided to be inclined and extend rearward as it goes downward,
A second bent portion between the rear portion of the toe board panel and the floor panel;
The upper surface portion has an upper surface bonding portion attached in the vicinity of the first bent portion,
The reinforcing member upper surface portion has a reinforcing member upper surface joint portion attached in the vicinity of the first bent portion,
The vehicle front body structure according to claim 1, wherein the upper surface joint portion and the reinforcing member upper surface joint portion are provided so as to overlap in a front view of the vehicle. The upper surface joint portion is an upper flange portion that extends upward from the upper surface portion and joins the dash panel,
The front body structure of a vehicle according to claim 2, wherein the reinforcing member upper surface joint portion is a reinforcing member upper flange portion that extends upward from the reinforcing member upper surface portion and is joined to the dash panel. . The front frame has an outer flange portion that extends outward in the vehicle width direction from the outer surface portion and is joined to the dash panel.
The floor reinforcing member has a reinforcing member outer flange portion that extends in the vehicle width direction outer direction from the reinforcing member outer surface portion and is joined to the dash panel.
The front body of a vehicle according to any one of claims 1 to 3, wherein the outer flange portion and the reinforcing member outer flange portion are provided so as to overlap in a front view of the vehicle. Construction.

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